Normal and abnormal motion of the shoulder

Poppen, N K; Walker, PS

doi:10.2106/00004623-197658020-00006

Cited by 788 publications

(426 citation statements)

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“…The predicted humerus translation was also in good agreement with in vivo and in vitro studies. A radiographic study on healthy volunteers reported an upward motion of about 3 mm from 0 to 30 degrees and a stabilization thereafter (only 1 mm upward or downward every 30 degrees) [9]. In another in vivo study, open MRI was used to measure the humerus translation on healthy subjects [10].…”

Section: Discussionmentioning

confidence: 99%

“…[6]. It is also justified by the limited translation ranges observed in cadaver [7] or in vivo studies [8][9][10], although larger translation ranges were also observed [11]. Most studies report an initial superior translation of 2-3 mm from 0 to 30 degrees of abduction, followed by a more stable phase up to full abduction.…”

Section: Introductionmentioning

confidence: 99%

“…Most studies report an initial superior translation of 2-3 mm from 0 to 30 degrees of abduction, followed by a more stable phase up to full abduction. From roentgenogram measurements on healthy volunteers, Poppen and Walker [9] concluded that the humeral head is fairly stable above 60 degrees of abduction, with only 1-2 mm of upward or downward translation every 30 degrees. With a similar method, Deutsh et al [8] observed no significant translation of the humerus from 0 to 120 degrees of abduction.…”

Section: Introductionmentioning

confidence: 99%

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An algorithm to allow humerus translation in the indeterminate problem of shoulder abduction

Terrier

Vogel

Capezzali

et al. 2008

Medical Engineering & Physics

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The shoulder is one of the most complex joints of the human body, mainly because of its large range of motion, but also because of its active muscular stabilisation. Actually, the numerous stabilizing muscles and degrees of freedom yield indeterminate biomechanical models. To solve this indeterminate, most models use reverse dynamics with a simplified ball-socket joint, preventing therefore the natural humerus translation. In this paper, an algorithm was specifically developed to solve the indeterminate problem by a feedback control of muscle activation, allowing the natural humerus translation. Abduction was considered in the scapular plane, accounting for the three deltoid parts and the rotator cuff muscles. The major aim of this study was to validate the numerical algorithm, which was here restricted to two-dimensions in order to compare the numerical solution to a known algebraic one. This comparison gave a relative error below 0.1%. The joint reaction force was comparable to other models and the humerus translation was in agreement with in vivo or in vitro studies.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An algorithm to allow humerus translation in the indeterminate problem of shoulder abduction

Terrier

Vogel

Capezzali

et al. 2008

Medical Engineering & Physics

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“…2,[16][17][18][19] There have been, however, few reports about AC motion using cadaver models, 20,21 roentgenography, 2 and the insertion of pins into the bone. 5 Recently, Meskers et al 3 and Pronk et al 4 evaluated in vivo motion of the clavicle and AC joint using 3D electromagnetic tracking systems.…”

Section: Discussionmentioning

confidence: 99%

3D kinematic analysis of the acromioclavicular joint during arm abduction using vertically open MRI

Sahara

Sugamoto

Murai³

et al. 2006

J. Orthop. Res.

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Many researchers have evaluated the motions of the shoulder girdle, especially scapular and humeral motion. However, few reports exist that describe motions of the acromioclavicular joint. The purpose of the present study was to analyze the 3D kinematics of the acromioclavicular joint during arm abduction using 3D MR images obtained by a vertically open MRI. Fourteen shoulders of seven volunteers were examined in seven static positions from 08 to the maximum abduction in a seated position. 3D surface models of the clavicle and scapula were created, and the movements of the acromioclavicular joint from 08 to each position were calculated using the volume-based registration technique. From these calculations, the translations were evaluated and the rotational motions were analyzed using the concept of the screw axis. In the anteroposterior direction, the clavicle translated most posteriorly (À1.9 AE 1.3 mm) at 908 of abduction and most anteriorly (1.6 AE 2.7 mm) at maximum abduction. In the superoinferior direction, the clavicle translated slightly superiorly (0.9 AE 1.9 mm). When analyzing relative motion of the scapula with respect to the clavicle, the scapula generally rotated about a specific screw axis passing through the insertions of both the acromioclavicular and the coracoclavicular ligaments on the coracoid process. The average rotation was 34.9 AE 8.48. ß

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“…[22][23][24] Use of 2-dimensional (2-D) radiographic and fluoroscopic techniques has shown abnormal shoulder kinematics in some subjects with impingement during humeral elevation. 25,26 The results of these analyses are difficult to interpret, however, because a variety of diagnoses exist in these patients. More recently, Lukasiewicz et al 27 quantified 3-dimensional (3-D) scapular orientation at static positions of arm elevation in the scapular plane by comparing subjects with and without impingement syndrome.…”

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confidence: 99%

Alterations in Shoulder Kinematics and Associated Muscle Activity in People With Symptoms of Shoulder Impingement

2000

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Background and Purpose. Treatment of patients with impingement symptoms commonly includes exercises intended to restore "normal" movement patterns. Evidence that indicates the existence of abnormal patterns in people with shoulder pain is limited. The purpose of this investigation was to analyze glenohumeral and scapulothoracic kinematics and associated scapulothoracic muscle activity in a group of subjects with symptoms of shoulder impingement relative to a group of subjects without symptoms of shoulder impingement matched for occupational exposure to overhead work. Subjects. Fifty-two subjects were recruited from a population of construction workers with routine exposure to overhead work. Methods. Surface electromyographic data were collected from the upper and lower parts of the trapezius muscle and from the serratus anterior muscle. Electromagnetic sensors simultaneously tracked 3-dimensional motion of the trunk, scapula, and humerus during humeral elevation in the scapular plane in 3 handheld load conditions: (1) no load, (2) 2.3-kg load, and (3) 4.6-kg load. An analysis of variance model was used to test for group and load effects for 3 phases of motion (31°-60°, 61°-90°, and 91°-120°). Results. Relative to the group without impingement, the group with impingement showed decreased scapular upward rotation at the end of the first of the 3 phases of interest, increased anterior tipping at the end of the third phase of interest, and increased scapular medial rotation under the load conditions. At the same time, upper and lower trapezius muscle electromyographic activity increased in the group with impingement as compared with the group without impingement in the final 2 phases, although the upper trapezius muscle changes were apparent only during the 4.6-kg load condition. The serratus anterior muscle demonstrated decreased activity in the group with impingement across all loads and phases. Conclusion and Discussion. Scapular tipping (rotation about a medial to lateral axis) and serratus anterior muscle function are important to consider in the rehabilitation of patients with symptoms of shoulder impingement related to occupational exposure to overhead work. [Ludewig PM, Cook TM. Alterations in shoulder kinematics and associated muscle activity in people with symptoms of shoulder impingement. Phys Ther. 2000;80:276 -291.]

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Normal and abnormal motion of the shoulder

Cited by 788 publications

References 0 publications

An algorithm to allow humerus translation in the indeterminate problem of shoulder abduction

An algorithm to allow humerus translation in the indeterminate problem of shoulder abduction

3D kinematic analysis of the acromioclavicular joint during arm abduction using vertically open MRI

Alterations in Shoulder Kinematics and Associated Muscle Activity in People With Symptoms of Shoulder Impingement

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